Hi there,
It seems you have done most of the troubleshooting steps. You can try Resetting the windows update components and see if that helps you out.
-Right-click on the start button and select Powershell (admin) or Command Prompt (admin)
-Copy and paste each command and hit enter after each line.
net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
Ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
Ren C:\Windows\System32\catroot2 Catroot2.old
net start wuauserv
net start cryptSvc
net start bits
net start msiserver
-Restart the computer after reset update components are completed.
You can also try getting the updates manually and see you can install them.
You can get the updates by KB number from the below link
https://www.catalog.update.microsoft.com/Home.aspx
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